Bottom-Up Synthesis of Titanate Nanosheets in Aqueous Sols and Their Morphology Change by the Addition of Organic Ligands and Dialysis

Ban Takayuki; Nakagawa Takuya; Ohya Yutaka

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Bottom-Up Synthesis of Titanate Nanosheets in Aqueous Sols and Their Morphology Change by the Addition of Organic Ligands and Dialysis

机译：钛酸酯纳米片在水溶胶中的自下而上合成及其添加有机配体和渗析的形态变化

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The size, shape, and stacking of titanate nanosheets synthesized by heating aqueous mixtures of titanium complexes and tetrabutylammonium hydroxide were dependent on the type and amount of organic ligands and the amount of tetrabutylammonium ion (TBA+). When titanium isopropoxide was used as the titanium source, most titanate crystals were smaller than 10 nm in lateral size. However, the use of titanium complexes provided a lateral size of about 100 nm. The titanate crystals were synthesized by the acid-base reaction of titanic acid and TBAOH. The decrease in titanic acid concentration by titanium complex formation led to larger titanate crystals by the inhibition of crystal nucleation. Moreover, the use of triethanolamine and lactic acid as an organic ligand provided round and hexagonal titanate crystals, respectively. However, when the concentration of organic ligands was decreased by the dialysis of the titanate sols, the form of titanate crystals was changed to a rhombic shape. Thus, the adsorption of organic ligands on the titanate crystals probably influenced the shape of the titanate crystals. Furthermore, the decrease in TBA+ concentration by the dialysis of the sols inhibited the stacking of the titanate nanosheets during the evaporation of the sols.

机译：通过加热钛配合物和氢氧化四丁基铵的水性混合物合成的钛酸酯纳米片的大小，形状和堆叠取决于有机配体的类型和数量以及四丁基铵离子（TBA +）的数量。当使用异丙醇钛作为钛源时，大多数钛酸酯晶体的横向尺寸小于10 nm。然而，钛配合物的使用提供了约100nm的横向尺寸。通过钛酸和TBAOH的酸碱反应合成钛酸酯晶体。钛配合物形成引起的钛酸浓度的降低通过抑制晶体成核而导致较大的钛酸盐晶体。此外，使用三乙醇胺和乳酸作为有机配体分别提供了圆形和六角形的钛酸酯晶体。然而，当通过钛酸盐溶胶的透析降低有机配体的浓度时，钛酸盐晶体的形式变为菱形。因此，钛酸酯晶体上有机配体的吸附可能影响钛酸酯晶体的形状。此外，通过溶胶的透析降低的TBA +浓度抑制了溶胶蒸发期间钛酸酯纳米片的堆叠。

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《Crystal growth & design》 |2015年第4期|共7页
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Ban Takayuki; Nakagawa Takuya; Ohya Yutaka;
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1. Bottom-Up Synthesis of Titanate Nanosheets in Aqueous Sols and Their Morphology Change by the Addition of Organic Ligands and Dialysis [J] . Ban Takayuki, Nakagawa Takuya, Ohya Yutaka Crystal growth & design . 2015,第4期

机译：钛酸酯纳米片在水溶胶中的自下而上合成及其添加有机配体和渗析的形态变化
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Bottom-Up Synthesis of Titanate Nanosheets in Aqueous Sols and Their Morphology Change by the Addition of Organic Ligands and Dialysis

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